PythonObject ^ PythonObject -- exponentiation of Python objects

Raise one Python object to the power of another.

In addition to the Macaulay2-style ^, this operation is also available using the Python-style **.

Note that parentheses were not necessary in the latter case since ** has much lower precedence than ^.

If one of the arguments is a Macaulay2 object, then it is first converted to a Python object before exponentiating.

In Python, the ^ operator corresponds to the bitwise xor operation. We use ^^ in this case for consistency with the rest of Macaulay2.